The team used the Spitzer Photometry and Accurate Rotation Curves (SPARC) database to study the rotation curves of 175 galaxies. They compared the rotation curve of each galaxy to the average distribution of nearby galaxies. If the dark matter model is correct, the distribution of nearby galaxies should not affect the rotation curve. If MoND is correct, the distribution and resulting external field effect (EFE) should affect the curves.
Surprisingly, shockingly even, their study found a clear effect. In galaxies with the strongest external fields, the EFE was confirmed with a confidence of 8 to 11 sigma.